Microstructure, mechanical properties and fracture behavior of in-situ Al-5Mg-Al4Sr composites

Biswas, Prosanta; Biswas, Apratim; Bhandari, Rahul; Mondal, Manas Kumar

doi:10.1016/j.mtcomm.2018.03.011

Cited by 16 publications

(2 citation statements)

References 41 publications

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“…It also demonstrates great machinability and high fatigue strength. With these properties, Al-Mg alloy is extensively used in aviation, shipping, construction, transportation, and rail transit [3][4][5]. However, Mg is supersaturated in the matrix of Al-Mg alloy (e.g., Al-4.6Mg alloy).…”

Section: Introductionmentioning

confidence: 99%

Effect of Sr on Microstructure and Strengthening Mechanism of Al-4.6Mg Alloy

Yang

Dong

et al. 2023

Materials

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The as-cast Al-4.6Mg alloy was subjected to deformation and sensitization–desensitization heat treatment, and then the microstructure and the enhancement mechanism of Sr were investigated by optical microscopy, scanning electron microscopy–energy-dispersive spectroscopy, electron backscatter diffraction, and transmission electron microscopy. The precipitation phases of Al-4.6Mg alloy were mainly β-Al3Mg2, Al6Mn, and Al6(Mn Cr), and the nanoscale precipitation phases were Al3Mn and Al11Mn4. The formation of β-Al3Mg2 was hindered by the addition of 0.1 wt.% Sr. In addition, the precipitate phase Al4Sr and the nano-sized precipitate phase τ-Al38Mg58Sr4 were uniformly distributed in the spherical matrix. The addition of Sr promoted the redissolution of Mg atoms in Al-4.6 Mg alloy, increasing the solubility of Mg in the α-Al matrix from 4.7 wt.% to 5.1 wt.%. The microstructure analysis showed that Sr addition inhibited the recovery and recrystallization of the alloy because the Sr element elevated the recrystallization temperature. As a result, the grain deformation was intensified, the grain size was decreased from 6.96 μm to 5.39 μm, the low-angle grain boundaries were increased from 78.7 at % to 84.6 at %, and the high-angle grain boundaries were increased from 21.3 at % to 15.4 at %. Furthermore, the mechanical properties of the alloy were significantly improved, and the plasticity degraded after the addition of the Sr element. The yield strength of the alloy was enhanced mainly through fine grain strengthening, dispersion strengthening, solid solution strengthening, and working hardening. The strengthening mechanisms were analyzed in detail.

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Section: Introductionmentioning

confidence: 99%

Effect of Sr on Microstructure and Strengthening Mechanism of Al-4.6Mg Alloy

Yang

Dong

et al. 2023

Materials

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“…Some of the common reinforcements that have been produced in situ are TiB 2 , TiC, ZrB 2, AlN, Al 2 O 3 , Al 4 Sr, Mg 2 Si, and (Mg,Ni) 3 Si . Aluminum alloys with TiC, TiB 2 , and ZrB 2 reinforcements can be prepared by the addition of halide salts.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Hot‐Rolling Reduction on the Mechanical Properties of In Situ Formed Aluminum–Magnesium–Silicon (Al‐Mg₂Si) Composites

2019

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The effects of hot rolling on the microstructure and mechanical properties of as‐cast Al‐15Mg2Si, Al‐20Mg2Si, and modified Al‐15Mg2Si in situ composites are studied. During rolling, the primary and eutectic Mg2Si particles undergo mechanical fragmentation and move along the rolling direction, which results in the enhancement of ductility of the composite compared to the as‐cast state. At high reductions in thickness, however, severely elongated grains and some cracks are observed in the matrix, which are related to the retardation effect of the widely dispersed particles and also fast cooling of sheets during rolling. These effects are found to be responsible for the observed high tensile strength and low ductility of heavily rolled sheets. It is revealed that the strength–ductility balance of the hot‐rolled sheets, as measured by the tensile toughness, is inferior compared to that of the commercially pure Al sheet as the basis for comparison. Therefore, relatively low reductions in thickness are recommended for processing of these composites. The hot extrusion of these composites is also briefly discussed, and it is characterized as a viable route for processing of these composites to achieve high tensile strength with acceptable ductility.

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Evaluation of a Cast Al-Mg2Si Composite for Automobile Disk-Brake Rotor Application

Biswas,

Mondal

2023

J. of Materi Eng and Perform

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Microstructure, mechanical properties and fracture behavior of in-situ Al-5Mg-Al4Sr composites

Cited by 16 publications

References 41 publications

Effect of Sr on Microstructure and Strengthening Mechanism of Al-4.6Mg Alloy

Effect of Sr on Microstructure and Strengthening Mechanism of Al-4.6Mg Alloy

Evaluating the Effect of Hot‐Rolling Reduction on the Mechanical Properties of In Situ Formed Aluminum–Magnesium–Silicon (Al‐Mg₂Si) Composites

Evaluation of a Cast Al-Mg2Si Composite for Automobile Disk-Brake Rotor Application

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Microstructure, mechanical properties and fracture behavior of in-situ Al-5Mg-Al4Sr composites

Cited by 16 publications

References 41 publications

Effect of Sr on Microstructure and Strengthening Mechanism of Al-4.6Mg Alloy

Effect of Sr on Microstructure and Strengthening Mechanism of Al-4.6Mg Alloy

Evaluating the Effect of Hot‐Rolling Reduction on the Mechanical Properties of In Situ Formed Aluminum–Magnesium–Silicon (Al‐Mg2Si) Composites

Evaluation of a Cast Al-Mg2Si Composite for Automobile Disk-Brake Rotor Application

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Evaluating the Effect of Hot‐Rolling Reduction on the Mechanical Properties of In Situ Formed Aluminum–Magnesium–Silicon (Al‐Mg₂Si) Composites